linux-kernel - [PATCH] x86: print microcode revision on PEBs errors

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Message-ID: <20131030193150.GA7765@redhat.com>
Date:	Wed, 30 Oct 2013 21:31:50 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: print microcode revision on PEBs errors

On Sandy bridge CPUs with old microcode, PEBs
fails and suggests a microcode update.
Print out the required and the actual revision to
make it easier to figure out what's wrong.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 arch/x86/kernel/cpu/perf_event_intel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index f31a165..81f2789 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2105,6 +2105,8 @@ static int intel_snb_pebs_broken(int cpu)
 		}
 	}
 
+	pr_info("PEBS checking: microcode 0x%x min legal 0x%x\n",
+		cpu_data(cpu).microcode, rev);
 	return (cpu_data(cpu).microcode < rev);
 }
 
-- 
MST
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